Hi Perry,
I realise your post is almost a month old, so you may have resolved this now. However, if not, please see https://docs.vmware.com/en/VMware-Horizon/2111/horizon-upgrades/GUID-1B116018-B472-4B27-BF55-23EAB3F... which details the dsmgmt commands to make the current node the schema master when you don't have an existing Horizon 8 ver 2006 or later.
Jon
